Weft detector on loom transferrer



March 27, 1928. 1,663,902 A. J. CHEVRETTE WEFT DETECTOR ON LOOM TRANSFERRER Filed Dec. 27, 19 26 15 5 41mm Jaw/m? WZL M Patented Mar. 27, 1928.

UNITED STATES PATENT OFFICE.

AUGUSTIN J. CHEVRETTE, OF WORCESTER, MASSACHUSETTS, ASSIGNOR TO CROMPTON & KNOWLES LOOM WORKS, OF WORCESTER, MASSACHUSETTS, A CORPORATION OF MASSACHUSETTS.

WEFT DETECTOR ON LOOM TRANSFERRER.

. Application'filed, December 27, 1926.

This invention relates to improvements in detectorwhich shall cooperate with a bobbin to give proper indication of weft exhaustion independently of the conical form of the yarn on the bobbin.

In patent to Ryon #1372516, there is shown a transferrer arm having a detector thereon, both of these elements being moved downwardly toward the shuttle when the latter is on the magazine side of the loom. Detectors of this type have heretofore been made with a side slipping yarn engaging member made to move either toward or away from the bobbin butt. When moving toward the butt an indication is likely to be given prematurely if the detector surface engages the conical part of thebobbin tapering toward the butt, and if the detector moves toward the tip of the bobbin a pre-v mature indication is likely to result when the mass of yarn tapers toward the tip. It is an important object of my present invention to provide a detector having preferably a pair of oppositely moving detectors both of which must slide along the bobbin before indication of weft exhaustion will be given.

The particular manner shown herein for actuating the detector mechanism to cause the same to move toward the bobbin makes use of the inertia of the moving mass of the detector, a spring being provided to hold the detector normally in raised position so that it will be able to move downwardly toward the bobbin when the transferrer arm is brought to a sudden stop at the bottom of its stroke. It is a further object of my invention to have the weft detectors disposed on opposite sides of the line along which'the mass moves so that the pressure of the detectors may be equalized.

Detectors of the type speclfied herein are now made with a plunger normally held in retracted non-indicating position by a latch pivoted to the transferrer arm and having holding engagement with the plunger. As heretofore made the latch 'liashad a vertical tail and at the time of indication the nl'ajor component of this movement has been hori Serial No. 157,047.

zontal. It is a still further object of my invention to extend this tail horizontally so that its major component atthe time of indication will be vertical, thus permitting the spring for.tl1e lach tojhelp thedetector in moving upwardly after indicating movements. that on'indicating beats of the loom the detector moves to a position lower than usual and there is, therefore, the possibility that the front wall of the shuttle will engage the detector on the backward stroke of the lay. I

It is a more particular object of the invention to have the detector carrier slidably mounted in the transferrer arm and held against angular movement by a trip which that part of the transferrer arm which normally extends from the surface to be de- This is desirable in view of the fact 7 tected and showing the parts in non-indicating position with present,

Fig. 2 is a View similar to Fig. l but with insuflicient supply of weft present and the detector moved to indicating position, Fig. 3 is a. fragmentary top plan view takenin the direction of arrow 3 of Fig. 2,

Fig. 4 is a horizontal section on line 4-4 of Fig. 2, a

Fig. 5 is a detail. vertical section on line 55 of Fig. 2, and I Fig. 6 is a fragmentary vertical section on line 6'6 of Fig. 1. i

Referring to the drawings, a 'transferrer arm 10 has a bobbin engaging heel 11- and a yarn engagingtiplQ. Vertical side-walls 13 connecting said heel and tip define a vertical slot 14 across which extends pin 15; Pivoted on said pinis a latch 16 having'a hook 17 normally holding headlS of a pltmger 19. Sald plunger has an'indicating end 20 which moves in a horizontal bore 21 of web 22 era a suflicient supply of-weft tending between the walls 13. A clip 23 secured. to the transferrer arm partly closes the inner opening of bore 21 and a spring 24 interposed between the clip and the indicating portion tends to move said plunger outwardly from the position shown in Fig. 1 tothat shown in Fig. 2. The latch which normally prevents this movement has a torsion spring 25 surrounding pin 15 and having one end thereof held by the transterrer arm as at 26 and the other endextendmg. over a portion of the latch as at 27 to hold the latter inthe position shown in Fig. 1.

On eachTde'tecting beat of the loom' the *tra'nsferrer arm is moved (.lownwardly toward thegsurface to be detected, the plunger 19 remaining in non-indicating position when there is a sufficient supply of wei'ton the bobbin B and moving outwardlyto the indicatingposition shown in Fig. 2 when there is an insuiiicient supply of weft on the bobbin. The matter thus far described is common with the exception of certain portions of the latch and forms'no part of my present invention.

My i rovem'ents relate more particularly to t e detector and a portion of the latch, and in carrying my invention into etupwardly extending horn 40 having a cylindrical bore 41 therein; A-plunger 42 is mounted in the bore for tree vertical move 7 ment and maybe flattened on one side thereon,as' at 43, to have secured thereto the:

49 thereinone of which receives the; left end of a wire spring 48. The right end of said wire is located between a pair or collar-s56 which areclamped together by screw 51 pass ing into a portion of the transfer-rerarm. Said spring 48 can have the pressure exerted thereby varied by the turning of screw o. r' by inserting theleft end thereof into one or another of the openings 49.

The'lower end of the trip 44 is adapted for engagement with a horizontally extending tail 52015 the latch 16 and adjustment'between the trip and the tail may be aflorded by a slot '53 'formed in the upper endof the trip' 'through" which i the "screw 45- extends.

When making the vertical adjustment; of

a the trip the wire 48 may be inserted into one or another offthe' openings '49 to give the correct pressure. a

. The yarn engaging portion of. the detectors'comprises a'pai-r of substantially similar butoppositely moving detectors 60 each pivoted as at 61 to a plate 62 secured in the yarnengaging toothed portions 65 of the detectors, although this relation is not nec-, .essary.

The 'upperend o r eachdetector is bent 7 back on itself .so as .to be Ueshapedas shown in Fig.4, each detector therefor havmg pivotalcontact with its pivot 61 on both sides of the plate: As shown in Figs. 1 and 2 thedownwa'rdly extending portion of one detectoris on the front of plate 62 while the corresponding portion of the other "dc-J tector isfin. back of the platen fThis. makes; it possible to usesubstantially'similargd esl tector. elements without causing interference. The form of detector illustrated here:

in is set forth more particularlyinmy co pending application Serial No. 154,407.

Under-:normal conditions i the movable parts of the detectorareheld yieldinglylin raised position by' spring :48 land. as 'the'f transi'crrer. is" brought .It'oQa sudden. stop at. the lower end of its {strolie',.:the plnnger42f Wlll slide downwardly-in the bore 41 against} the action of the spring tobringthe detector, I

60 into contact with the yar'nion the bobbin; As shown in Fig. 1, when suiiicient yarn is:

present the detectors are'held against angular i novement around pivots 61 and. the plunger 42 is arrested in its downward movement before the trip .44 can engage the tail 52 of the latch. The plunger 19 therefore remains in non-indicating position. as "the transierrer arm is ra sed and .no Iind-icating movement is. given. tothe angular lever, not

shown herein, but set,..fortl1 .inxthe aforesaid patent to Ryon- Wheninsufiicient weft, is, present however; the detectors. slicle,,alongthe denuded bobbin .to the position shown inFig. 2, thus permitting'the-plunger42; to

move downwardly far.enouglrfonthe trip' 44 to engage the tail 52 and raise the latch,

compression spring 24fthereupon moving the plunger 19 .to the indicating position shown At ragtime the plunger and parts carried thereby-are'lowerlthanonlnonindicatingbeatsand it isthere'fore desirable torgive them a'quick upward movement in. order that they may-clear.the front wallet-i in Fig. 2.

the shuttle as -the' lay..1n oves @rearward'ly.

This result ..is accomplished in part-j joy the spring. 48 which- "i'iorin'ally. performs; this function and iriapartbythe torsion sp ing.

25 which," by engagement of the vertical portion 47 of the trip 44 with the latch helps to :raise the plunger on indicating beats. When released the head ofthe latch may engage the inner end of the indicating plunger to prevent undue angular movement of the same in a clockwise direction as viewed in each detecting beat of the loom. It is necessary for both detectors to slide along the bobbin before indication results, so that if a conical surface of yarn is presented to either detector such as normally to cause indication, the plunger 19 will not be released if the other detector is in contact with yarn. It will further be seen that the trip 44- moving in slot 46 holds the detectors in parallel alignment with the surface to be detected. Also, it will beseen that the latch serves the purpose not only of controlling the indicating plunger but also exerts an upward force on the trip and detector mechanism when the latter is in its lower position and needs to be removed from the path of the shuttle. Means are provided for varying the vertical position of the trip with respect to the plunger and provision is also made for a compensating adjustment between the trip and the spring 48. 1

Having thus described my invention it will be apparent that changes and modifications may be made therein by those skilled in the art without departing from the spirit and scope of the invention and I do not wish to be limited to the details herein disclosed, but what I claim is:

1. In a weft detector mechanism for a loom having a transferrer arm movable on detecting beats of the loom toward a surface to be detected, a carrier slidably mounted on the transferrer arm in a direction toward and from the surface to be detected, a pair of detector elements pivoted to-the carrier at spaced points, said elements being disposed diagonally with respect to each other and having weft engaging surfaces spaced with respect to the surface to be detected, and means to effect indication of weft exhaustion at such times only as both detectors slide along the surface to be detected.

2. In a weft detector mechanism for a loom having a transferrer arm movable on detecting beats of the 100m toward a surface to be detected, a carrier movable on the transferrer arm toward and from the surface to be detected, detecting means on the carrier to prevent a complete movement of the latter when weft is present, said detector moving when weft is exhausted and said carrier having a complete movement toward the surface being detected, indicating means including a pivoted latch, a tripon the carrier, and an indicating element controlled by the latch, said trip being out of contact with the latch when weft is vpresent but moving into engagement with the same by a movement toward the surface to be detected when the detector has an indicating movement and the carrier has a complete movement toward the surface being detected.

3. In a weft detector mechanism for .a

loom having a transferrer arm movable on ments having spaced weft engaging surfaces, and means to prevent angular movement of the carrier relatively to the transferrer arm to keepthe weft engaging surfaces in proper alignment relatively to the surface being detected. Y

4. In a weft detector mechanism for a loom having a transferrer arm movable on detecting beatsof the loom toward a surface to be detected, a carrier substantially cylindrical in cross section and slidably mounted on the transferrer arm toward and from the surface-being detected, a pair of detecting elements mounted on the carrier and having spaced weft engaging surfaces, means to indicate weft exhaustion including a trip mounted on the carrier, and means fixed with respect to the transferrer arm to engage the trip and prevent angular movement thereof and of the carrier'relatively to the transferrer arm, whereby the detecting surfaces are held in proper alignment withrespect'to the weft surface being detected.

In testimony whereof I have hereunto affixed my signature.

AUGUSTIN J. CHEVRETTE. 

